In-wall humidity sensor



FIG. 1 is a perspective view of one embodiment of an in-wall humidity sensor illustrating aspects of the new ornamental design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a back view thereof.

The environmental structure shown with broken lines in the drawings forms no part of the claimed design. 

CLAIM The ornamental design for an in-wall humidity sensor, as shown and described. 